The movie will premiere on June 7

The official website for the movie adaptation of the Children of the sea has uploaded a enw trailer which you can see bellow:

My Anime List describes the story as follows:

“One summer vacation, Ruka meets two boys, “Umi” and “Sora,” whose upbringing contains strange and wonderful secrets. Drawn to their beautiful swimming, almost more like flying, Ruka and the adults who know them are intertwined in a complex mesh...

Meanwhile, an unexplained anomaly is occurring all over the world: fish are disappearing. Thus begins a marine adventure of boys and girls to captivate all the senses!”

Ayumu Watanabe is directing the film at Studio 4°C

Via: Crunchyroll Latín América (Spanish)